Indicating gas-analyzer.



y J. WBSTOVBR. INDIoA-LNG GAS 1111111.12133.A

o. o. MAILLOUX @L H.

APPLICATION NLBD 11111121, 1910.

Patented Jan. 9, 1912.

c, o. MAiLLoUX & H. J. WESTOVER. INDIGATING GAS ANALYZBR.

' PPLICATIN FILED JAN. 21,1910. I 1,014,241 Patented Jan.9, 1912.

5 SHEETS-SHEET 2.

C. O. MAILLOUA @L nul. WBSTOVER.

INDIGATING GAS ANALYZER.

APPLICATION FILED JAN. 21, 1910.

Fatented Jan. 9, 1912.

5 SHEETS-SHEET 3.

Lll

y ma.

4 I gqmlwamm c@ u. o. 111111111011111 H. J. WBSTOVBR. INDICATING GAS ANALYZBR.`

APPLICATION FILED JAN.21,1910.

Patented J an. 9, 1912.

C. 0. MAILLOUX E H. J. WESTOVBR.. INDIGA'HNG GAS ANALYZER.

APPLICATION FILED JAN. 2l. 1910, 1,014,241. Patented Jan. 9, 1912.

5 SHEETS-SHEET 5.

9.. mento/:S

mbo/M1213 e' UNITED ,srnrns :e

Armar ernten.

CYPRIEN-o. MAILLOUXAND HENRY J, WE's-rovna, or New Yonx.- N. Y

INDICATING ensfAnALYznn,

Specification of Letters Patent.

Application led January 2 1, 1910. Serial No. 539,419.

Patented Jaa. 9,191 2.

To all whom it may concern:

Be it known that we, CYPRIEN O. Mau.` Lolix and HENRY J. l/VEs'lov'nn, citizens ol' the -United States, residing in the city, county, and State of' New York, have 1nventeda ccrtainnew and useful Improve-.

. ltaneous indications `of such proportions in a manner torprovidethe maximum of cer tainiy lHand. convenience'.

Uur .apparatus lends, itself readily to number of various Aapplications, among which maybe prominently mentioned the analysis andindication of COL, percentages in tliejiluegases `of boilersorlhe exhaust of gas ngin I t-,Lmaygv also rbe used'for a ducer gas, wherein, however",I the 'probable range ofpercentageswill be nite different fro'mithat to bel expectedv in tie cases first named.4 urapparatus lends itselftoqeasy special i design fon any expected .range oi' indications.v 'Y i. Our present `invent-ionl is 'illustrated in certain preferred forms in the accompany ingdrawings,r wherein'lff- A`Figure-1 is an upper' plan view on alarge scale of the indicatmgjcircuit closer and showing `the selectiie'switch in partial section, F1g. 2 is a diagram on a: large scale of the electricjcircuits associated with the selectiveI switch `and showing said switch partly in ele' ation' partly in section, Fig. 3 is ann-id .view iifl the selective switch showing the preferred arrangement of certain conductors, Fig. t is a diagram of the general circuitsaspreferably arranged, Fig.

.5 and Figo are detail views of individual 4polarized signals in 'the annunciator,.F1g.

7 is general elevation ofthe entire analyzeigfilig. 8 isa plan'jview of the upper portion 'of the s an'leunder the linear-:eef Fig 7, and F1gs. 9 to 13 are enlarged detail views of certain .portions of the analyzer.4 `f

' invent-itin as adapted toi'giving successive indications of the p'encentuges. of' C0,l (or' "mixed gases, at

ns'ffurna producer all delivering nie, to thesame central analyzer. It will, however be understood that it is wit-hin the scope of our present invention to adapt the same to use with a single source of gas or with more than four sources.`

In the form shown the central analyzer shown in Fig. L"is associated with four separate annunciators with which it is-successively and automatically placed in operative connection by means of a selectivel switch 10 'and'.'its associated circuits. tive switch may take a. great variety of forms which will suggest themselves to those skilled in this art. One of the preferred forms is shown in Figs; 1 to Il, wherein a central. insulating rei-*oluble core '11, carries a row of buttons 12 adapted to press upon corresponding xedcontacts arranged in' four equidistauty rows, 13, 14, 15 and 16, supported by the outer .framework of the switch 10. The fixe-d contacts are soA disposedas- .to form, not only vertical` rows 13 to 16, but horizontal rii'igs of four as shown in Figs. 1 and 3.- The contacts 13 to 16 in each alternate ring of four are electrically connected to the binding posts or terminals 17, 18, 19 and Q0, respectively; while the This selecfour members of the other alternate rings are all connected together by a conductor 2l as shown 1n Fig. 3, which 1n turn leads to a binding post in the row marked 22.

Fig. 2 is a diagram wherein two diametrically opposite rows of contacts lil and 16 are shown, and fromv which the arrangement of circuits in relation to the rows 13 and 15 will be readily understood. ln the particular arrangement shown there are four rows of fixed contacts, corresponding 'to four separate sources of gas to be' analyzed, and in each row are nine pairs of fixed contacts corresponding to ,eight indications of percentage in the annunciators hereinafter described. These numbers may of course be ivaried'according to the particular conditions to be met in any case.

The buttons 12 on the rotary inner core 11 are connected electrically in pairs. This we preferably accomplish as shown by pros viding'eachbutmn with a guiding stem'23,

connected each to its neighbor `on one side.

by a wire 24. Each pair of stems 23 passes through a separate conduct-ing plateA 25 which serves 'further to establish the neces sary electric connection. 'As'shown in Fig. 2, these pairs of electrically united buttons are s o placed with respect to the fixed buttons, with which they may be brought suc-. cessively into contact by rotation of' the switch, as to serve by such contact to-form an electric bridge from one of the inde' pendent buttons (connected to terminals 17 to 20) on the one hand, and the electrically united buttons4 (shown in Fig:f3 and yconn'ected to terminals A22) on the other hand. For this' reason these maybe termed bridgfor successive Vluse with four sources of mixed gas will first be described, the varil ous parts being explained afterward in detail.

rl`he electric motor 33, provides power for motion of all the partis, its high speedbe- 4float 83, ,to the top of which 1s' fixed a stem lreduced by meansof twosliccessive worms 34, connected bythe worm wheel 36. -The worm'A 'operates both through' -worm wheel 87 to run the displacing plungers, and through worm wheel 3S tof 0perate the main timing-switch 39 mounted on the shaft of said wheel. The displacing cylinders 40, 41, are moved 'loosely up and down within the cy1inders'42, 43, y means of racks 44, v45, engaging the gear 46, turning with the gear 47 which is operated by the rack 48, attached to the crank 49 on thel shaft of the wheel 37. The shaft of the wheel 38 drives the gear- 50, andtheinclined shaft '51.--',:-Thc gear 50rotates 'the switch 10- .heretofore- -describcd and also drives 4the .gear 52, which operates the four way valve i :33, hereafter described. By means of bevel-'f gears 54, the shaft 51 turns the rotary' cyl inder-canr' whereby a rotary reciprocation is 'imparted tothe toothedsector -56,:-

stcm' .38 of'the three-way valvet).

,The displacing' plunger or uhich'acts through the gear 57 to turn the nun-"ing up and down within the `reservoir Vfrom' the induction pipe 62 (througl 1542 causes an appropriaterise. andgfall of liquid in'thc gas pumpingchamberf'f,

-By this means gasfis alternatelyflriiwnf permanent liquid seal 63), and or'ced'o through the edu'ction pipe 64, 't vthe san-lef time, and acting. in opposition with 40, the

, displacing plunger 4l alternately'raissandlowers the 'l 'vel of liquid inthemeasuring' chann'ier [6J `and the: supplemental' float 'chan'.berf 66 which are connected 'together and to the cylinder 43 by themain pipe 67 and the branches 68, 69. The chamber 65 communicates with the `atmosphere by means of the straight open tube 70, and com( ea'ch other andthe rod 84. The arm 87 is are balanced by a Weight 8S, to which they pistoni '401.'

tains a float- `7l-, properly balanced as by a weight 72, connected to said float by the chain 73 passing over the vpulle 74 and -down through said tube 70. 'lipon this chain is mountedA the circuit controlling 7g tappet (See Fig. '9.) The lower end of 'the tube 70 extends far enough down into the chamber 65 to leave -a suitable measuring'spacejwithin 'said chamber above the lower end ofthe'tube, wherein a predeter mined quantity of gas at atmospheric pres sure is confined by the-rising of li uid with# in said chamber 65. A pipe 76 o -ine bore connects the 'top of the measuring chamber 65 with the invertedbell 77 within the -80 Aabsorption.chamber 78. This latter chamber communicates -wit-h the atmosphere by openings/79 inthe top, and, for convenience itis supplied with a proper absorbing liquid (for instance a solution of caustic potash) by means of the pipe 80 leading from :inappropriate reservoir 81. and commanded Within the (chamber '66 there moves'a 84, passing out through the tube 85, and carrying the. principal automatic `circuit .elosenf This last com' rises two laterally projecting arms 86 .an 87, insulatedfrom 95 a flexible spring, and the two are so placed as tomake contact when the two arms-descend far. enough to strike the tappet 75, over which b0tharms extend as shown.A f Ilhe' float 83 ancbthe parts attached thereto .100

are connected by a cha-in 89passing ver a pulley 90. AThe rod 84fisv arranged t ,command the position of one or more witch arms. 91," o f corresponding indicating 105 switches best shownin Figs. land 4; :.Eaclr arm 9l 'is preferably made in two parts of conducting materia'hconnected as shown by insulation 92, provided. with an opening .through ,which therod 84 passes. Under'llo eaclrari'n 491, and Vadjustably threaded on the Yrod S4 is a'lifting nut 93 upon which rcststh'e insulating portion of the switch arm."

In Fig.` 7, we havesho'wn two indicating A115 switches to show that our 4apparatus is .capable of. I-cor'nmanding simultaneously nygreasouable number of indicating sysr Eachswitch arm i's'la'terally flexible,

844 along, but normally out of contact with, the separated "switch contactsv 9 4-, behind whichfislocated the Velectromagnet 95. VVire I 4prefer toplacefa confining bar 96 ontsdethe' normal v'plane of movementof the switch '125 arm 91. The magnet, or magnets, 95 are ina. local circuiti-97, supplied bya generator 98.

As shown in Fig/7, this circuit includes the principal circuit closing arms 86, STand is closed when these a-rms :touch each other. 1 30 ts oii'ter entremity ism'oved by the rod 12.0 i

There is also in the circuit 97 one side of a relay 99, whereby we preferably use a strong exterior circuit 100, including the other side of said relay and the ybrushes 101 bearing upon 'the rotary switch 39 heretofore described. By this. means we are enabled to use a local circuit l01:' say' .fifteen volts in conneetionwi-th the ordinary 110 volt light-.ciro'uit.

In Fig. 1 is shown a diierent form of relay circuit, wherein theexternal Vcircuit 102 drives a small niotor-generator 103, ,101, suppliedthrough @inappropriate switch 105. The armature of the generator .104 is connectedto local Ina-ins 106, 107, whereby cui-,V

@rent is supplied for purposes of indication.

The motor 33, which actuates 'the various portions of the analyzer as above described, may be also employed as the motor portion of thisA motor-generator. Our invention vis not, however, limited to this particular arrangement, but covers vthe use in this connectionoffany motor-generator. It is to -be further understood thatf'our invention is not limited to theuse of an exterior circuit and a localcircui-t. ()bviously asingle source of currentm'ay beitelied, uponfor operation of allfpartsofourapparatus'f l. i Before `pri J' ':ee din'g, ,Qto 1 explain the particu- 1arf'manner shownin the drawings,- forcausing the lposition,ofgcztlie switch-,arm 91 to4 avifectvtheindicator 'orsannunciaton we shall explain-the l'operation'of the mechanism so far deseribedowasjto makeclear `the means.

.wllerebylthe position ,of said arm 91 zit-the l momentpffcircuit losu're is made dependent uponftlfjroportionor percentage of CO5, or other gas to he determined in the Amixture essential to this invention) comprises a fixed base 108, shown in scctionin'Fig. 10 and in plan view `in Fig. 11.. The' pipe 62 whereby'- sanples of gaslare-led from this valve tol,V the pumping .chamber G0 enters under y, the* base 108 and ends vin an opening at th'e'top of said base. Samples of mixed gases fromythe four individual ksources are led to the base by-.iour-pipes 109, 110, 111, 1,12, which leadiuder thegvalve to obliquely cut chambers 113,114, 1'15,116,cutin the body of said i base. oisaidchambers communicates witlithetop of-said base through two open ings 1-1-7.,".`1181at diferent distances frornfthe. center, TheseV arek so placed that the' four f openings 117 lie je circle v col'ice'nti'ic 'with the pipeL'-G2,`g,w\hfrle;,theqopening 118lies in another circle aroundthe` same center.-

Upon the upper plane ysurface ofil the base 'g 108 there rests amoyable Ymember 119', closely fitting said plane surface and adapted to revolve upon it. The movable member is provided with 'a central opening 120, which registers with the 'central opening in the base, and communicates by a radial chamber 121 with two vertical passages, 122, 123, so placed as toregister successively with the .respective openings 117,118, as the movable member revolves. The movable member 119 is confined to its 'seat' by a shell 124, bolted or otherwise, fastened to the base. A spring 125 bears down uponl the niov'able'melnber, the top of which is provided with a pair of lugs 126 between which' fits the end of the shaft 127 of the gea-r wheel 52, whereby the movable member is revolved. Vlt vwill be seen that, as this movable member 'is'.continuously rfvevolvcd by the motor 33, as heretofore described, the chamber 121 will transmit to the pipe 62` two successive fractional. portions ot' the samegas mixture, from the openings 117, 118, respectivelyof eaclrchamber in the fixed base. By vuse ofV this arrangement We are enabled to obtain' the requisite quantity of gas without using-unduly large'vali-e openings, thus eflicieutly .separating 'the various conveyers of differentV gases.y l lVe shall now explain the operation of the entire automatic analyzer, whereby the armv (or :t1-nis) 91 is .made to assume a position corresponding to the proportions'of CO2 (or vother gasto-be determined) in the mixture;

Assumingtheparts to be inthe position shown in Fig. 7, and the -motor'33 to be 'running, the chamber will' be free ofliquid, due to the fact that the plunger /10 hasjust fallen. into the chamber 60 through (32 from the proper pipe v(-109, 110,111, or 112) 'say through one of thelopenings 117 inthe valve 53,' whichhas just closed. 1n l this position, the plunger L11 'being depressed, the displaced liquid has filled thef vessels G5, 66, driving out all previous gas from 65, 'at first through the pipe '7 0 to atmospherewd then, after' the liquid rises above the lower end of 70, driving the measured quantity still in. the chamber 6:3, through the pipe 76,

three-way valve 59 and pipe 70', into vthe bell 77, where the absorbingliqu'idds 'displaced, rising around the inner bell 'in the outer vessel 7S. Ot' 'course ythe floats will rise in both chambers (36' and 05, carrying with` them thecircuit closer 86. 87, on the one hand and the abutment on the other hand At this time the main selecting switch 10 will complete communication herein after described) between the arm 91 and the particular aunu'nciator or other automatic indicator corresponding to the particular source of mixed gases 'frpxn which gas has i just been forced into the chamber 77, 78.

As the motor 33 continues to move, the rack` Gas has thus, been caused to rush risen and the 4level ot the liquid in. 60 has 48, moving downward, will cause depres-.

. will cause two move ents of gas to take place. ,One of these is a transfer of al1 the gas from chamber 60, through the pipe 64 and three-way 'valve 59 to the atmosphere, by' pipe 128 and water Yseal 129.- This is called the scavenger gas, and its function is to clear the 'pipe'tlil ofV any portion ofthe previously tested sample of gas which may remain therein, substituting gas of the same quality and proportion'iis that next tobe tested. The 'second movement of gas is the return from the absorbing chamber, 78,.through the-tube 7 6 and valve 59 to the measuring chamber 65. It is the action of this residual gas which determines the indication of percentage. It is clear that, the greater the perpenta ge of CO2, (or other gas absorbed in 78) the .greater will be the diminution -of, volume of the ori inally measured gas due to absorption.l -low as the two lioats 71 and 83'move downward simultaneously, the former will at first move thefaster, 'owing to pressure ofV absorbing liquid .ing7 8, acting through the residual-gas.

vHence the tappct 7 5 will keep safely in ad- .vance 'of the circuitv closing arms 86, 87.

As downwardmotion continues, however, the residual as will be more. and more rarefied, until nally it willA reach a point where the pressure of the atmosphere ex- Verted through the 'pipeV 70 will prevent furfloat 83, with the circuit closer 86, 87 and the switch arm 91 will continue, and in c onsequence the arm S7 will finally touch the tappet. 75, which will cause closure of circuit at 86, andwill energize the' magnet 95. This will cause the'arm 91 to move lat# c rallyA against .the particular switch contact 94 to which it is'opp'osite at the moment circuit-is closedat S6, 87, thereby producing an ind'ication'of the desired percent age, preferably in the manner hereinafter desciibed. At this time the circuit at switch 39 is closed. -Wheii nexttlie plungers 40, 4l, reverse their movement, the risin'g of 40 will'draiv into 60 a second sample of t-he same mixture of gas as wasused as a scavenger.4 This will come through the particiu.

lar opening 1.18 in the valve 53 which cor- '-iesponds to the open-ing 117 through which the scavenger gas ywas drawn. At the same time, the lowering of 41 forces lliquid upward in chambers 65, 66, raising both lfloats and forcing out all gas from 65 through the three-way valve to atmosphere at 129f .The plungers 40, 41, will then again reverse their movements, when, by Adescent of ,40, the newisample will be' reed over through the valve 59. to chamber 65. At

the same time liquid will recede again in chambers 65 and 66. During thisidescen'ty the circuitcloser 86, 87, may touch the tappet 75, but this will ,be without result, because the switchv39 will be open. Further movement simply repeats the operation l above described for the sample of gas from the next successive source.

The means whereby' the position of the switch arm 91 or its equivalent ma be made to produce an appropriate indication of the percentage of 'gas' tested may be greatly varied without depart-ing from our invention. Our preferred apparatus for this urpose is illustrated diagrainmatically in i 4, taken in connection with Figs. 1, 2 and The arrangement of Fig. 4, as alread -stated, is 4intended for use with a main hig tension and a low tension local circuit.

When circuit is closed at 86, 87, it is broken there again almost instantly. Con`-v sequently we insert a circuit preserving device in 'this circuit, prefera y comprising the solenoid 130, whose core operatesa conducting bar 131 which acts to close a branch circuit around the principal circuit closer S6, 87, through the solenoid itself. 'By this" means the indicating circuit is rendered sufficiently reliable to insure operation of the annunciator.' When the switch 39 breaks the principal circuit, the core of the solenoid 130 is released. i

Any appropriate form of annunciator may be used without departing from our inven tion. One preferable form is shown in Figs. 4, 5. and 6. The mutual relation of two of these is shown in Fig. 4, together with their connections with jtheselecting switch shown in Figs. 1 to 3. The remaining two aiinunciators should be connected in the same way. Each annunciatorcomprises a row of polarized electro-magnets,V whose poles 132 and 133 are arranged to be separately energized. The pole 133 acts to throw the shutter' 134 to the left hand position in nsf Fig. 5, where' itis invisible. The pole132, throws the shutter to the right handposition through' the selecting switch Asguinin' this to be the upper annunciator in Fig. Ll,

l this'circuit will run as follows: from generator 101, by wirelO to arm 91, to binding post 136, similar post 2Q, contact member 5 4 from 'the bottom in the row 19, by wire 137 to magnet pole 132 which is third from the left in the top annunciator, to wire 158, by

- magnet 139, wire 14-0, terminal 141, thence through all the restoring coils on poles 133 in two parallel branches to wire lil-2, to the lower-most terminal 19, through switch to the lowermost terminal LQ, and back by wire 10G to the generator. 'This will cause a suitable indication by throwing of a shutter, while, at the same time any previous indication will be eiliaced by the action of the weaker dividedcurrent through the restoring coils. At the same time, the ener gized magnet 139, acting upon tlie switch armature 143, will open the alarm circuit 144, referred to hereinafter. lt will be seen that this last effect will accompany the ac tion olf-each of the magnet poles132, except the last to the left in the figure. This extreme pole corresponds to anextreme condition of analysis, and in many cases it will be `:found desirable to rovide an alarm of some kind vtocall attention to the extreme condition inv question. F or this purpose the preierred device shown comprises a magnet 145 Whchattracts an armature 14.6, whereby an alarm circuit is closed from the main circuit 102, through a lamp 147. A ma et 148 in this circuitukeeps lt'closedV until the next .8 5 indication other Athan the extreme one occurs, -When, as above mentioned, the magnet 139 isenergizedi and circuit is opened at 143. It will be seen that by use of this apparatus, the central automatic analyzer produces,

V40 in each annunciator successively, an indication of the percentage of gas in the particular sample mixture just tested. Since the selecting switch 10 and the four-way valve 53 move constantly in correspondence,

itis possible to give correct indications at desired intervals of the percentage of certain gas existing in a. number of mixtures successively.. ,Each source of gas mixture has a separate annunciator appropriated to it, and all of the annunciators -may be placed Wherever found most convenient. It is obvious that our invention iscapable ot' use with .an desired reasonable number of sources of gas mixture, and `thatwe are not 'confined to four as shown.

' Many different modifications of structure and varrangement may be introduced' into t-his device without departing from our invention, and weare not limited tothe details ..60 herein shown and described. i

'What We cla-im is 1. A device of the class described comprising in combination an automatic gas analyzer, a plurality of gas conveyors, a num- 3-ber of separate temporary` indicators each complete in itself, `and means for automatically and successivelybringing each conveyer and its corresponding indicator lnto operativerelation with said analyzer, substantially as described.

2. A device of the class described comprising in combination an automa-tic gas an- ,alyzeig a plurality of gas conveyers, a numlbei` of separate temporary indicators each comprising means for preserving its indication for a limited interval of time, and means for automatically and successively bringing each conveyer and its corresponding indicator into operative relation with said analyzer, substantially as described.

3. A device of the class Adescribedcomprising in combination an automatic gas analyzer, a plurality of gas conveyers, a valve for connecting said conveyers successively to said analyzer, a plurality of electro-magnetic annunciators each comprising indicating and'restorinr circuits, a selecting switch for connecting oth said indicating and restoring circuits in each annunciator successively to said analyzer, and means for causing said valve and selecting switch to operate always in appropriate correspondence, substantially as described.

4. A device of the class L described comprising in combination an automatic gas analyzer, al plurality of gas conveyors, a valve for connecting said conveyers successively to said analyzer, a plurality'of electro-magnetic annunciators, a selecting switclnan external 'main circuit, alocal circuit depending thereon and including said analyzer and said switch, circuits between said switch and said annunciators, and means for causing said valve and selecting switch 'to operate always in appropriate correspondence, substantially as described.' 'f

A device of thel class described comprising in combination an automatic gas analyzer, a plurality of gas conveyers, a valve for connecting said conveyers successively to said analyzer, a. plurality of electric annunciators, a main circuitarranged to be controlled by said analyzer, a local circuit deriving its energy from said main circuit, means actuated by said main circuit for closing sain local circuit, a selecting switch for controlling the relation of said local circuit witli said annunciators, and means for causing said valve andseleeting'switch to operate always in appropriate correspond.- ence, substantially as described.

6. A device of the class described comprising in combination an automatic gas analyzer, a pluralityof gasconveyers, a valve iis erator vfor controlling 1 described.

S. A device of the class described comprising in combination an automatic gas analyzer, a multiple contact switch controlled thereby, a number of electric indicators, each separate from the others and complete in itself, a number of gas conveyers, a select-4 ing switch, 'a valve for said conveyers, means for causing said selecting switch and valve to move in correspondence, and means controlled by said analyzer for periodically directing current' through said switches to said indicators successively, substantially as del scribedi 9. A device of the class described comprising in combination an automatic gas analyzer, a swinging switch lever moved thereby, 'a rou of switch contacts over which said lever is adapted to swing, a multiple electric indicator, circuits between said 1ndicatorand said switch contacts, electromagnetic means tending, when energized, to draw said llever against one of said contacts, and a circuit for said electro-magnetic means controlled by said analyzer, substantially as described.

l0. A device of the class described coinprising in combination an automatic gas. analyzer, a multiple contact switch controlled thereby, an electric indicator, an alarm associated with said indicator, an alarm circuit, means for controlling said alarm circuit, and operating circuits controlled by said switch for operating said last named means and said indicator, substantially as described.

11. A device of the class described comprising an automatic gas analyzer, a multiple contact switch operated thereby, and a plurality of indicators; in combination with a selecting s witch adapted to move in unison ivith said analyzer and comprising a-separate'row of xed contact buttons for each of said indicators avherein the .alternate buttons areK electrically connected reof said first named conveying pipes andl having two openings located in different radii and at different distances from the center ,of said valve, and a movable portion having a passage permanently in' communi'- cation with said pipe leading to`the analyzer and having two openings adapted to register successively with the two openings of the various passages in the fixed portion of the valve, substantially as described.

18. A device of the'class described comprisin an automatic gas analyzer, a number o gas conveying pipes from various sources, and a single conveying pipe leading to said analyzer; in combinationwith a valve at the junction of said pipes adaptnections between` said single pipe and each ot' said first named conveying pipes in suc. cession, substantially as described.

14. A device of the class described comprising indicating means in combination with an automat-ic gas analyzer comprising 4ed to establish a. plurality of distinct cona float carrying a circuit closer, a second' float carrying a tappet adapted to operate said circuit closer when contact is made therewith, a.liquid vfor moving said V ioats up and down, means .for admitting atmospheric pressure to the liquid supporting said first named float, and means `for subjecting theliquid supporting said second fioat to the pressure of the residue left after absorption of one of its ingredients from a 'measured quantity of mixed gas,

Witnesses so far. as regards Cyprien O.u 

